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← ScienceWhich mechanism explains redshift of distant galaxy light crossing voids?
A)Integrated Sachs-Wolfe effect✓
B)Cosmological principle expansion
C)Hawking radiation conversion
D)Supernova elemental nucleosynthesis
💡 Explanation
The Integrated Sachs-Wolfe effect redshifts photons. Because as photons traverse gravitational potential wells (voids), the expansion of the universe causes the potential to change during transit; therefore the photon loses energy, rather than blue shifting as it exits.
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